Regarding the Felicity comparison: I found an even earlier and just as obvious "borrow" from MSCL. It's in season 1 of Felicity when she's considering having sex with Noel. She walks through either a dining hall or lobby and has almost the exact same realizations about sex that Angela does when she's thinking about having sex with Jordan. It's the whole, he has sex, she has sex, they could be having sex together right now but that Angela does in her head.